Arcanamirium Crafter subschool is listed on pp. 28-29 of the 'Inner Sea Primer' Player Companion (PZO9414). It is the first of three subschools listed there. Perhaps the others are also missing.
Looking for something else I just discovered that Arcananium Crafter is there - as an archetype rather than subschool as I expected. It seems to provide the correct options as written in the primer.
These ended up being coded as Archetypes not following the subschool model. I’ll have to fabricate a conversion.
This still seems to be an issue. I can see this and the other Inner Sea Primer schools in the isp_abilities_class.lst file, but none of them show up in the program under the archetypes tab. I can see the Metacharge feature that this particular school would add in the Wizard Class Features section, but as is there is no way to get it.